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Effect of multi-ethers and conventional alkoxysilanes as external donors on the 4th generation Ziegler-Natta catalysts for propylene polymerization

  • Catalysis
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Abstract

The multi-ether compounds with different numbers of methoxy groups containing 1,3-dimethoxy-2,2-bis(methoxymethyl)propane and 1-methoxy-2,2-bis(methoxymethyl)butane were synthesized using the Williamson reaction from pentaerythritol and 1,1,1-tris(hydroxymethyl)propane, respectively, in the presence of sodium hydride and methyl iodide in tetrahydrofuran and they were characterized by 1H NMR, 13C NMR, and FTIR spectroscopy. These compounds were employed as external donors in the polymerization of propylene using the industrial Ziegler-Natta catalyst. A commercial spherical MgCl2-supported Ziegler-Natta catalyst containing diisobutyl phthalate as the internal donor was used for the polymerization of propylene. The role of ether compounds and industrial alkoxysilanes on the properties of polypropylene were studied using the xylene solubility method, melt flow index, gel permeation chromatography, scanning electron microscopy, and differential scanning calorimetry. The addition of the electron donors has led to improvements in the activity and selectivity of the Ziegler-Natta catalyst system.

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Authors and Affiliations

  1. Department of Polymer Engineering, Amirkabir University of Technology-Mahshahr Campus, Mahshahr, 63516-43659, Iran

    Seyed Heidar Mirjahanmardi

  2. Department of Polymer Engineering, Amirkabir University of Technology, Tehran, 15875-4413, Iran

    Faramarz Afshar Taromi

  3. Department of Chemistry, Amirkabir University of Technology, Tehran, 15875-4413, Iran

    Roya Zahedi

  4. Iran Polymer and Petrochemical Institute (IPPI), Tehran, 14977-13115, Iran

    Mehdi Nekoomanesh Haghighi & Roghayeh Jamjah

  5. Polymer Laboratory, Marun Petrochemical Company (MPC), Mahshahr, 63531-69311, Iran

    Gholamali Jafari Asl

Authors
  1. Seyed Heidar Mirjahanmardi
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  2. Faramarz Afshar Taromi
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  3. Roya Zahedi
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  4. Mehdi Nekoomanesh Haghighi
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  5. Roghayeh Jamjah
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  6. Gholamali Jafari Asl
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Correspondence to Faramarz Afshar Taromi.

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Mirjahanmardi, S.H., Taromi, F.A., Zahedi, R. et al. Effect of multi-ethers and conventional alkoxysilanes as external donors on the 4th generation Ziegler-Natta catalysts for propylene polymerization. Polym. Sci. Ser. B 58, 619–628 (2016). https://doi.org/10.1134/S1560090416060129

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  • DOI: https://doi.org/10.1134/S1560090416060129

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